As we walked out toward the bridge we came upon a observation walkway
which extended out over the canyon. I would
have walked out to the end of this windswept point but somebody had to take the
picture, so Laura had all the fun for me. During
the construction, the handling of the individual
wires comprising the main cables was
accomplished by means of power drawn carriers operating over haulage cables,
suspended along each side of the bridge. Twenty-five per cent of the wire
was stored near each anchorage. Each reel, placed in a ball-bearing
rotating table equipped with suitable brake devices, was unwound as its wire
was pulled across the canyon and the previously prepared anchor loop was
released from the carrier and deposited over its anchor pipe. Hand operated grab lines, dropped from each tower apex, lifted each wire over
the saddles and tension adjustments were then made in the following sequences:
first, between the anchor pipe just mentioned and the adjustment tower; second
between this tower and midspan; third, between midspan and the second tower; and
lastly between the second tower and the final attachment to a pipe anchor. The
one inch wire ropes, which were originally strung to the catenary, served as templates
for the stringing of wire strands, and remained as the core of the finished
cable. Anchoring of the main cables constitutes an interesting feature of the
structure. This was accomplished by first trenching the solid granite on
the same inclination as the backstays for a distance of approximately 75 feet
and to a maximum depth of 25 feet. In the bottom of this rock trench,
which was roughly 4 feet wide, two lines of holes 18 inches apart were drilled to
receive sections of 2 inch pipe which were 3 feet long. There are 100
pipes grounded into each trench. After fastening 21 wires to each pipe, a
1/4 inch reinforcing bar was inserted and also grounded. These bars were
allowed to extend approximately to the top of the trench. As a final
operation the trench was filled with concrete. By far, for me, the most
dramatic part of this hanging masterpiece was the floor, mainly because it
is made of wood planks with not all of them bolted down. The planks which
measure some 18 feet across are suspended from the cables at 10-foot intervals
with 11 inch suspender rods supporting the I-beams. Walking across gave me
an excellent view of the river canyon below, through the large separation of
some of the boards. Yuck, I hate heights! Right when I got just
about to the middle of the thing, it began to shudder and then shake. I
grabbed onto the side wall and stood there looking around for what was causing
this vibrating distraction. Boy! was I surprised when I saw a medium size
school bus driving onto the bride and coming right at me. The bridge shuttle
runs back and forth about every 15 minutes, giving rides to those who either
can't or won't walk over to the other side. It is quite an experience to
be in the middle when the bus passes by. We could have also driven our car
across as many do. Once the bridge was finished and opened, the city
fathers looked for other ways to attract visitors. There was also a desire
to put the local bridge workers, now out of work, back to work. In 1930 an
Incline Railroad was started. Using the same people that built the bridge,
a section next to the bridge was evened out to support a rail car system which
would descend to the canyon floor and the river below. When finished it became
the worlds steepest incline railway. We decided that in order to cover
this vehicle in all its proper perspectives one of us would ride down to the
bottom while the other filmed from the top. I immediately elected Laura
for the ride down (:-). I found a spot on a cross-over observation ramp
where the tram left from and settled down with the chipmunks to watch the
adventure. The tram consisted of several small stand up cars with wire
screen all around except directly in front of where Laura was standing. Upon
her return, Laura described her experience as quite enjoyable. The train
moves very slowly. Probably not more then 5 miles per hour. The rock
face on both sides show the scars of those who cut their way down to build
the track. There is a small landing at the bottom where she was able to stand
and watch the river gliding by.
LAURA: The trip down the incline railway was fantastic. Although the incline was
very steep, the cars, being moved by a cable, were able to move slowly. It was a
trip that I certainly wouldn't want to do on foot. We traveled through a trough
cut in the rocks, and at the bottom I could look up at the bottom of the great
bridge, high above. The trip up was very nice and I got a different view of the
incline as I went up.
*** THE END ***
<<<<< Back HOME PAGE Next >>>>>